pypromice.core.variables.radiation submodule added

[PennyHow]

radiation submodule is for:

• Converting radiometer measurements from engineering to physical units
• Filter shortwave and longwave radiometer measurements
• Correct shortwave radiation for station tilt and TOA irradiance
• Calculate albedo
• Calculate cloud coverage
• Calculate surface temperature

As a result of the shortwave radiation correction and albedo calculation re-factoring, the routines related to station position/tilt were split and put into a submodule called pypromice.core.variables.station_pose. The station_pose submodule is for:

• Calculating sun position relative to the station
• Calculating sun angle relative to the station and the upper radiation sensor

!! Working in progress, not yet finished !!

[PennyHow]

Ready for review @ladsmund. Note the comments where I have highlighted things I am unsure about.

[github-actions]

Dataset Comparison Report

✅ Datasets match perfectly!

No differences have been found between the datasets produced using the PR branch and the main branch.
⚠️ This report is generated from a small subset of test data that does not reflect all scenarios. Please check using more input data if you suspect changes to the output data have occurred.